When flu season arrives, most advice focuses on your lungs, your immune system, and your vitamin D levels. But there is another ecosystem quietly working as your body's first line of defence every single day. One that faces its own set of seasonal challenges. And one that most flu season content never thinks to mention.
The microbiome you probably never think about
Did you know your skin is not a single microbiome? The oily environment around your face, the moist areas such as your armpits, and the relatively dry skin on your forearms all provide completely different conditions for microorganisms. Your skin is a collection of microbial ecosystems, each adapted to the particular environment of that part of your body.2
Living across the surface of your skin is a complex community of bacteria, fungi, and other microorganisms known as the skin microbiome. Together with the skin itself, these microbes form part of an important protective barrier between you and the outside world. Research shows that the skin microbiome interacts with skin cells and the immune system, contributing to barrier function and protection against potentially harmful microbes.1
Think of your skin not as a sterile surface to be cleaned but as a living ecosystem to be maintained. That shift in framing changes everything about how you approach it, especially in winter.
What winter actually does to your skin ecosystem
Cold weather is tough on skin. Lower temperatures and reduced humidity can reduce skin barrier function and contribute to dryness and irritation. Indoor heating compounds this by creating a drier environment still.3
You probably recognise this as dry hands, tight skin, itching, or those small cracks that seem to appear from nowhere in October. What most people do not realise is that these are not just cosmetic inconveniences. The skin barrier and its microbiome are closely connected. When the barrier is disrupted, the skin environment changes, and the microbial community living there is affected too.4
The flu season dilemma most people feel but nobody resolves
Here is where winter creates a genuine tension for anyone thinking carefully about their microbiome.
Handwashing is one of the most effective ways to reduce the spread of viruses. The NHS recommends washing your hands regularly with soap and water, including after coughing, sneezing, or blowing your nose.5 This is not up for debate.
But frequent washing, particularly with hot water or harsh products, contributes to the dryness and irritation that is already being caused by cold weather and indoor heating. The answer is not to wash less. It is to protect the barrier while maintaining good hygiene.
The practical resolution is simple: wash your hands consistently and moisturise afterwards. The NHS recommends emollients for dry or irritated skin because they help trap moisture and protect the skin barrier.6 This is not about feeding your skin bacteria with a specialist product. It is about maintaining the environment in which your skin and its microbial community normally function.
The same principle applies to hand sanitiser. Alcohol based sanitiser is useful when soap and water are not available, but frequent use can leave hands feeling dry or irritated. Moisturising regularly is the straightforward counterbalance.
Does your skin microbiome protect you from flu?
Here is where it is important to be honest about what the science does and does not show.
Your skin microbiome contributes to the skin's defence against potentially harmful microorganisms, and researchers are increasingly interested in how skin microbes interact with the immune system.7 But flu is primarily a respiratory infection. Your skin barrier is not going to stop an inhaled droplet.
What your skin microbiome does is form part of your body's broader defence network, a living ecosystem that interacts with your immune system every day. Looking after it is not a flu prevention strategy. It is a long term investment in maintaining the conditions your body needs to function well.
At Gutology, this is the philosophy we apply across everything we make: that healthy ecosystems do not need disrupting. They need the right conditions to thrive. The same thinking that guides our oral care and our Skin Biome prebiotic deodorant applies here too. Support what is already there rather than stripping it away.
What actually helps this winter
You do not need a complicated microbiome skincare routine. The basics are more useful.
Keep washing your hands. Do not sacrifice infection prevention for the sake of your skin microbiome. The goal is to remove potentially harmful contaminants while avoiding unnecessary irritation.
Moisturise after washing. Apply a moisturiser after handwashing to replace lost moisture and support the skin barrier. This is the single most practical thing you can do for your skin during flu season.
Be gentle. Very hot water, aggressive scrubbing, and harsh cleansing products make already dry skin worse. Gentle cleansing is enough for most everyday situations.
Do not overcomplicate your skincare. The skin microbiome is a living ecosystem and we are still learning how different products affect it. If a product promises to rebalance your microbiome overnight, a little scepticism is healthy.
The bottom line
Your skin is doing far more than keeping your insides in. It is a living ecosystem, home to a diverse community of microorganisms that interacts with your skin cells and immune system every day.
During flu season, the biggest challenge for your skin is probably not the flu virus itself. It is the combination of cold weather, dry air, heating, and frequent handwashing that disrupts the barrier your skin microbiome calls home.
Keep washing your hands. Keep them moisturised. Be gentle with your skin.
And remember that supporting your microbiome does not mean buying another product. Sometimes looking after the ecosystem you already have simply means protecting the environment in which it lives.
Healthy ecosystems are not about adding more. They are about creating the right conditions for what is already there to thrive.
